add: struct encoding/decoding
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42
24-structs/06-encoding/main.go
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42
24-structs/06-encoding/main.go
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"encoding/json"
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"fmt"
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)
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type permissions map[string]bool // #3
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type user struct { // #1
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Name string `json:"username"`
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Password string `json:"-"`
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Permissions permissions `json:"perms,omitempty"` // #6
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// name string // #1
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// password string // #1
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// permissions // #3
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}
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func main() {
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users := []user{ // #2
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{"inanc", "1234", nil},
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{"god", "42", permissions{"admin": true}},
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{"devil", "66", permissions{"write": true}},
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}
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// out, err := json.Marshal(users) // #4
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out, err := json.MarshalIndent(users, "", "\t") // #5
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if err != nil { // #4
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fmt.Println(err)
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return
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}
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fmt.Println(string(out)) // #4
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}
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47
24-structs/07-decoding/main.go
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47
24-structs/07-decoding/main.go
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"bufio"
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"encoding/json"
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"fmt"
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"os"
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)
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type user struct {
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Name string `json:"username"`
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Permissions map[string]bool `json:"perms"`
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}
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func main() {
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var input []byte
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for in := bufio.NewScanner(os.Stdin); in.Scan(); {
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input = append(input, in.Bytes()...)
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}
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var users []user
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if err := json.Unmarshal(input, &users); err != nil {
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fmt.Println(err)
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return
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}
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for _, user := range users {
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fmt.Print("+ ", user.Name)
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switch p := user.Permissions; {
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case p == nil:
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fmt.Print(" has no power.")
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case p["admin"]:
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fmt.Print(" is an admin.")
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case p["write"]:
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fmt.Print(" can write.")
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}
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fmt.Println()
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}
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}
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17
24-structs/07-decoding/users.json
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17
24-structs/07-decoding/users.json
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[
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{
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"username": "inanc"
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},
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{
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"username": "god",
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"perms": {
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"admin": true
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}
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},
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{
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"username": "devil",
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"perms": {
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"write": true
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}
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}
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]
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